When - 3 ≤ x ≤ 1, the corresponding value of Y is 1 ≤ y ≤ 9, then the value of KB is 1______ ．

When - 3 ≤ x ≤ 1, the corresponding value of Y is 1 ≤ y ≤ 9, then the value of KB is 1______ ．

From the properties of the first-order function, when k > 0, y increases with the increase of X, so − 3K + B = 1K + B = 9, the solution is k = 2, B = 7, that is, KB = 14; when k < 0, y decreases with the increase of X, so − 3K + B = 9K + B = 1, the solution is k = - 2, B = 3, that is, KB = - 6, so the value of KB is 14 or - 6

Given the first-order function y = KX + B, when - 3 ≤ x ≤ 1, the corresponding value of Y is 1 ≤ y ≤ 9, the analytic expression of the first-order function is obtained

(1) When k > 0
-3k+b=1
k+b=9
k=2,b=7
y=2x+7
(2) When k

On the function y = KX + B (k, B are not equal to 0 constant), the following statement is correct ()
A. Y is proportional to X. B. y is proportional to KX. C. y is proportional to x + B. D. y-b is proportional to X

∵ for the function y = KX + B (k, B are constants not equal to 0), ∵ y-b = KX, ∵ y-b is proportional to X